a) Khloe Kardashian just bought a new cellphone case with silver accents. But is
ID: 637783 • Letter: A
Question
a) Khloe Kardashian just bought a new cellphone case with silver accents. But is it real silver? The mass of the accents was 13.89 g, warmed to 24.62°C and submerged into 5.2 g of water. The initial temperature of the water was 24.32 *C. The final temperature of tooth and water mixture was 24.47 "C. What is the heat capacity of the tooth? 1. b) Could the phone accents be silver? Explain your answer. 2. Provide the sign for AE for the following situations: A) Coffee cooling in a mug B) Car engine overheating C) Freezing milk to make ice cream D) Computer battery heating up 3. A55.0-g block of aluminum is initially at 27.5°C. How much heat (in J) must it absorb to reach a final temperature of 42.3 °C? 4. How much heat energy would it take to heat 250.0 g of water from 18.3'C to 37.5 C?Explanation / Answer
Ans, 1
Part a
Heat released by water = heat absorbed by accents
mw x Cpw x (T - T2) = ma x Cp x ( T1 - T)
5.2 g x 4.184 J/gC x (24.47 - 24.32)C = 13.89 g x Cp x (24.62 - 24.47)C
3.26352 = 2.0835 Cp
Cp = 1.566 J/gC = heat capacity of tooth
Part b
Actual specific heat capacity of silver = 0.235 J/gC
Calculated specific heat capacity of tooth = 1.566 J/gC
The phone accents is not silver.
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